If you click on Add an Attachment, you will see the box for adding Attachments.If you click on Posted Attachments, you will see a list of already attached Files and you are able to edit them.If you want to Replace (Upload new Version) an Attachment, you have to click both links. Add the Attachment as you normally would do, thereafter don't click on Add Attachment, rather click on Upload New Version at the Attachment Entry you intend to update.

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